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CVE-2020-6806

HIGH
8.8
CVSS Score
Published: March 25, 2020 at 09:14 PM UTC
Updated: June 17, 2026 at 03:23 AM UTC
4 products affected across 2 vendorsUbuntu LinuxFirefoxThunderbird

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Severity
HIGH8.8
Exploit prediction
EPSS 3%

Description

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0419.10
Firefox· Mozilla
95%
v < 74v < 74.0v < ESR68.6
Affected range stops below 74, so it looks safe — our inference, not a vendor statement
Affected range stops below 74.0, so it looks safe — our inference, not a vendor statement
Affected range stops below ESR68.6, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 68.6v < 68.6.0
Affected range stops below 68.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.6.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 68.6v < 68.6.0
Affected range stops below 68.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.6.0, so it looks safe — our inference, not a vendor statement

References (7)

x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html
x_refsource_MISCIssue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4328-1/
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/4335-1/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-08/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-09/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-10/

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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